小型直驱式永磁同步风力发电机快速最大功率追踪仿真研究

直驱式永磁同步发电系统的功率输出直接受发电机转速的影响。为了提高小型直驱式永磁同步发电系统的输出功率，通过分析风力机的工作特性以及最大功率追踪原理，指出经典爬山法的缺点，并提出一种新的变步长爬山法。根据前一次转速扰动和功率变化的梯度关系来决定下一次的扰动步长，可以提高系统的动态响应，扰动方向与经典爬山法一致。在最大功率点附近，功率波动小于一定值时，停止搜索，来实现最大功率追踪的快速性和稳定性。用仿真结果验证了该方法的可行性。

A simulation study of small direct drive type permanent magnet synchronous generator fast maximum power tracking

Output power of direct drive permanent magnet synchronous generator (PMSG) system is directly influenced by the rotational speed of generator. In order to improve the output power of small-scale direct drive PMSG, through the analysis of working characteristics of wind turbine and the maximum power tracking principle, this paper points out the shortcomings of classical hill-climbing method and puts forward a new variable step hill-climbing method. Using the relationship between the speed disturbance of time and power change gradient to decide the next step disturbance can improve the system dynamic response, and the direction of disturbance is consistent with the classical hill-climbing method. In the vicinity of the maximum power point, when power fluctuation is less than a certain value, the search will be stopped to realize the quickness and stability of maximum power point tracking. Simulation results verify the feasibility of the method.